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Method and apparatus for mitigating electromagnetic waves

a technology of electromagnetic waves and electromagnetic radiation, applied in the direction of electrical equipment, screening casings, aperture leaage reduction, etc., can solve the problem of undesirable energy, and achieve the effect of reducing electromagnetic radiation and being easy to install on the electroni

Inactive Publication Date: 2005-04-21
HEWLETT PACKARD DEV CO LP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0005] The present invention provides an apparatus that is easy to install on an electronic device and mitigates electromagnetic radiation emanating from the device. The apparatus attenuates both the escape of electromagnetic radiation from an opening in the EMC enclosure and the electromagnetic energy conducted along cabling extending from the electronic device and dispersed outside the chassis.

Problems solved by technology

This energy is undesirable and, if strong enough, has the ability to interfere with radio communications or the operation of nearby electronic apparatus.
Computer products present a unique set of issues relating to electromagnetic compatibility.

Method used

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  • Method and apparatus for mitigating electromagnetic waves
  • Method and apparatus for mitigating electromagnetic waves
  • Method and apparatus for mitigating electromagnetic waves

Examples

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Embodiment Construction

[0012] An electromagnetic energy shielding apparatus in accordance with an embodiment of the present invention is indicated generally at 10. As best shown in FIGS. 4 and 5, the apparatus 10 comprises a cover member 12, a retaining plate 14, and a bight 16. When mounted to an electronic device 18, as shown in FIG. 4, apparatus 10 is configured to bias the retaining plate 14 against cabling 20 extending out of an opening 22 in the EMC containment chassis 24 of the device 18. The retaining plate 14 minimizes the gap between the cabling 20 and the chassis as the cabling enters or exits the apparatus 10. Further, the overall configuration of the apparatus 10 significantly reduces the escape routes available for electromagnetic energy to disperse out of the apparatus.

[0013] In the exemplary embodiment, the apparatus 10 is formed of a single piece of sheet metal and is shaped into the configuration necessary for effective electromagnetic energy attenuation. The cover member 12 is a genera...

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PUM

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Abstract

The present invention is directed to a method and apparatus for mitigating electromagnetic waves emanating from an electronic device. The apparatus comprises a cover member, a bight extending from one end of the cover member, and a retaining plate spaced from the cover member and connected to the bight to provide a biasing force away from the cover member and towards an electronic device. The cover member is configured to overlie an opening in the chassis of the electronic device and the retaining plate is configured to abut cabling extending out of the chassis. In this way, the apparatus attenuates electromagnetic waves radiating emanating from an opening in a chassis of an electronic device and conducted along cabling as a noise signal superimposed upon the intended signal.

Description

BACKGROUND OF THE INVENTION [0001] This invention relates generally to a cover for an electronic device and, more particularly, to an apparatus for mitigating electromagnetic energy both emanating from an electronic device and dispersed from the cabling extending from the electronic device. DESCRIPTION OF THE RELATED ART [0002] In the operation of electronic devices, electromagnetic energy, typically radio frequency energy, is generated in addition to intended electrical signals. This energy is undesirable and, if strong enough, has the ability to interfere with radio communications or the operation of nearby electronic apparatus. The Federal Communications Commission (FCC) regulates electromagnetic energy radiating from an electronic device. Computer equipment sold in the United States must demonstrate compliance with FCC electromagnetic radiated emission levels, and thus computer equipment typically includes electromagnetic energy containment features, such as a metallic enclosure...

Claims

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Application Information

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IPC IPC(8): H05K9/00
CPCH05K9/0018
Inventor MIKSCH, EUGENE ARTHURBLAKELY, ROBERT J.
Owner HEWLETT PACKARD DEV CO LP